I use a parent ( my isp's) for my squid server on our lan. It therefor uses
another gateway (adsl) than the rest of my internet traffic wich uses the
default route (isdn). As I in my browser type an new url you can see some
initial traffic to the default route but the response (the pages) come from
the parent. I guess that the squid server is determining the shortest rtt
between using the parent and using a direct-to-origen-http-server.

I would like to force squid to only use the parent without determining the
shortest rtt. Only in case of a down status of the parent it should use a
direct-to-origen-server connection.